Estructuras sub-longutud de onda para el diseño de dispositivos en guía dieléctrica

Sub-wavelength structures are enabling the design of devices based in dielectric waveguides with unprecedented performance in both the near-infrared and mid-infrared wavelength regions. These devices include fiber-to-chip grating couplers with sub-decibel efficiency, waveguide couplers with bandwidths of several hundred nanometers, and low loss suspended waveguides. Here we will report our progress in the electromagnetic modelling and simulation of sub-wavelength structures, providing at the same time an intuitive vision of their fundamental optical properties. Furthermore, we will address design strategies for several integrated optical devices based on these structures, and present the latest experimental results for structures operating both at near and mid-infrared wavelengths.Universidad de Málaga. Campus de Excelencia Andalucía Tech

An Ultracompact GRIN-Lens-Based Spot Size Converter using Subwavelength Grating Metamaterials

AbstractGraded‐index materials offer virtually complete control over light propagation in integrated photonic chips but can be challenging to implement. Here, an anisotropic graded‐index metamaterial, synthesized with fully etched silicon subwavelength structures, is proposed. Based on this material, a spot size converter that expands the transverse electric (TE) mode field profile from a 0.5 µm wide silicon wire waveguide to a 15 µm wide waveguide within a length of only 14 µm is designed. Measured insertion losses are below 1 dB in an unprecedented 130 nm bandwidth, limited by the measurement setup, with full 3D finite‐difference time‐domain (FDTD) simulations predicting a bandwidth in excess of 300 nm. Furthermore, the device is well suited to feed fiber‐to‐chip grating couplers, while requiring a footprint ten times smaller than conventional adiabatic tapers

Biosensor fotónico integrado con capacidad de discriminación por capas.

Photonic integrated biosensors have emerged as a highly attractive alternative for biomarker detection in applications ranging from clinical diagnosis to food quality monitoring. Detecting specific target and differentiating them from interfering background effects is a crucial but challenging task nowadays. In this work, a complete system based on a dual polarization Mach-Zehnder interferometer with coherent detection is proposed to identify refractive index changes from different layers above the waveguide surface, herein, improving sensor specificity. To achieve this, a mathematical model is developed based on performing simultaneous measurements with two different polarization states. Simulation results show values of the limit of detection for each layer comparable to those reported in the state of the art.Este trabajo ha sido financiado por el Ministerio de Ciencia e Innovación (PRE2020-096438, PID2019-106747RB-I00); la Consejería de Economía, Conocimiento, Empresas y Universidad (P18-RT-793); la Consejería de Salud y Familias, (PIN-0113-2020); la Consejería de Universidad, Investigación e Innovación (PAIDI 2020, AT21_00153) y la Universidad de Málaga (Campus de Excelencia Internacional Andalucía Tech.

Integrated metamaterial surface-emitting antenna for beam steering applications

Integrated optical antennas are relevant devices for the development of next-generation LIDAR systems. Here we experimentally demonstrate a new topology to implement long antennas in silicon-on-insulator platform. The designed 2-millimeter-long antenna presents a measured far-field beam divergence of 0.1° and a wavelength sensitivity of 0.13°/nm.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech. HTSN Challenge Program at the NRC of Canada; Junta de Andalucía (P18-RT-1453, P18-RT-793, UMA18-FEDERJA-219); Ministerio de Ciencia, Innovación y Universidades (FPU16/03401, PID2019-106747RBI00)

Recent progress in subwavelength grating metamaterial engineered silicon photonic devices.

In this talk we present our recent advances in SWG metamaterial engineering. We will show a 1D-optical phased array composed of 112 evanescent-coupled surface emitting antennas with a length of 1.5 mm and fed by a compact distributed Bragg deflector. The measurements demonstrate a wavelength-steerable collimated beam with a far-field angular divergence of 1.8o × 0.2o. Experimental results of a bricked SWG 2×2 MMI coupler are also shown, achieving polarization agnostic performance in the 1500nm to 1560nm wavelength range. Both devices were fabricated on a standard 220-nm SOI platform using a single full-etch step process, with a minimum feature size of 80 nm, and thus compatible with immersion deep-UV lithography.This work was supported by the High Throughput and Secure Networks Challenge Program at the National Research Council of Canada (HTSN-209, 175363-HTSN 210); Ministerio de Ciencia, Innovación y Universidades (PID2019-106747RB-I00); Ministerio de Universidades (FPU19/02408, FPU20/03487); Junta de Andalucía (P18-RT-1453); FEDER Andalucía (UMA20-FEDERJA-158); Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Bricked and evanescently-coupled topologies: expanding the portfolio of subwavelength metamaterial silicon photonic devices

We present two novel topologies of subwavelength grating (SWG) waveguides: the bricked-SWG and the evanescently-coupled-SWG. The bricked topology enables accurate control of waveguide anisotropy while maintaining the index and dispersion engineering advantage intrinsic to SWG waveguides. The evanescently-coupled-SWG allows unprecedented control of the strength of the modal perturbation in waveguide Bragg gratings and nanophotonic antennas. Both topologies leverage a Manhattan-like pattern, with pixel sizes compatible with deep-uv lithography. Our recent results will be discussed, focusing on polarization-independent multimode interference couplers for the O and C bands and a millimeter-long narrow-beam steerable optical antenna array with angular divergence of only 1.8º×0.2º.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Modelado de ruido de una cámara para lectura de biosensores fotónicos multiplexados.

Los biosensores fotónicos basados en arquitecturas interferométricas de Mach-Zehnder con lectura de fase coherente han demostrado ser idóneos para la implementación de dispositivos de diagnóstico compactos, de bajo coste y con capacidad de detección múltiple de biomarcadores, susceptibles de ser aplicados en el punto de atención al paciente (PoC). El requerimiento de un sistema de interrogación con capacidad de lectura multiplexada que no comprometa la miniaturización del dispositivo y que facilite el alineamiento de la interfaz de salida, lleva a considerar el uso de una cámara como sistema de lectura. Para ello, se desarrolla un modelo sistémico de señal y ruido que cuantifica la degradación que sufre el límite de detección (LOD) en el proceso de adquisición de imágenes en comparación con un sistema de lectura basado en fotodiodos. Aunque se demuestra que la lectura con cámara provoca un empeoramiento del LOD, las ventajas que proporciona esta solución en cuanto al multiplexado hacen que no deba desestimarse su uso para determinadas aplicaciones.Este trabajo ha recibido financiación del Ministerio de Ciencia, Innovación y Universidades (PRE2020-096438, PID2019-106747RB-I00) y de la Junta de Andalucía: (PAIDI 2020, AT21_00153), Consejería de Conocimiento, Investigación y Universidad (PY18-793), Consejería de Salud y Familia (PIN-0113-2020) y la Universidad de Málaga, Campus de Excelencia Internacional Andalucía Tech

Design of subwavelength grating metamaterial waveguides for communications and sensing applications

In this work we will cover some of our recent advances in the design of state-of-the-art silicon photonic devices based on all-dielectric subwavelength grating (SWG) metamaterials. Specifically, we will focus on the design of tilted SWG waveguides, integrated anisotropic SWG lenses, spectral filters based on SWGs and SWG structures for evanescent field sensing.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Silicon high performance devices using subwavelength structures

Ministerio de Economía y Competitividad, Programa Estatal de Investigación, Desarrollo e Innovación Orientada a los Retos de la Sociedad (cofinanciado FEDER), Proyecto TEC2016-80718-R Universidad de MälagaSilicon photonics is poised to solve challenges in areas such as datacom, environmental monitoring and diagnostics, by leveraging the economies of scale afforded by CMOS manufacturing. This requires a wide variety of integrated silicon devices, including fiber-to-chip couplers, polarization splitters and waveguide couplers, operating both in the near-infrared and the mid-infrared wavelength range. However, the reduced set of materials available in this platform can often limit the performance of these devices. Subwavelength structures enable the synthesis of optical metamaterials, with properties than can be tuned to enhance device performance, by using fully etched silicon structures with a periodicity smaller than the wavelength of light. Here we review the basic operating principles of these structures, discuss how to efficiently model them, and report on the latest advances in this rapidly growing field.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech